mirror of https://github.com/bsnes-emu/bsnes.git
165 lines
3.5 KiB
C++
165 lines
3.5 KiB
C++
#pragma once
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#include <math.h>
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#include <vector>
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#include <nall/stdint.hpp>
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namespace nall {
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struct DSP;
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struct Resampler {
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Resampler(DSP& dsp) : dsp(dsp) {}
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virtual ~Resampler() {}
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virtual auto setFrequency() -> void = 0;
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virtual auto clear() -> void = 0;
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virtual auto sample() -> void = 0;
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DSP& dsp;
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double frequency = 44100.0;
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};
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struct DSP {
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enum class ResampleEngine : uint {
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Nearest,
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Linear,
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Cosine,
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Cubic,
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Hermite,
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Average,
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Sinc,
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};
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inline DSP();
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inline ~DSP();
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inline auto setChannels(uint channels) -> void;
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inline auto setPrecision(uint precision) -> void;
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inline auto setFrequency(double frequency) -> void; //inputFrequency
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inline auto setVolume(double volume) -> void;
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inline auto setBalance(double balance) -> void;
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inline auto setResampler(ResampleEngine resamplingEngine) -> void;
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inline auto setResamplerFrequency(double frequency) -> void; //outputFrequency
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inline auto sample(int channel[]) -> void;
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inline auto pending() const -> bool;
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inline auto read(int channel[]) -> void;
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inline auto clear() -> void;
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protected:
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inline auto write(double channel[]) -> void;
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inline auto adjustVolume() -> void;
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inline auto adjustBalance() -> void;
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inline auto clamp(const uint bits, const int input) -> int;
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struct Settings {
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uint channels;
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uint precision;
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double frequency;
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double volume;
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double balance;
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//internal
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double intensity;
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double intensityInverse;
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} settings;
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Resampler* resampler = nullptr;
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#include "buffer.hpp"
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Buffer buffer;
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Buffer output;
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friend class ResampleNearest;
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friend class ResampleLinear;
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friend class ResampleCosine;
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friend class ResampleCubic;
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friend class ResampleAverage;
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friend class ResampleHermite;
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friend class ResampleSinc;
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};
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#include "resample/nearest.hpp"
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#include "resample/linear.hpp"
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#include "resample/cosine.hpp"
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#include "resample/cubic.hpp"
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#include "resample/hermite.hpp"
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#include "resample/average.hpp"
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#include "resample/sinc.hpp"
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#include "settings.hpp"
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DSP::DSP() {
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setResampler(ResampleEngine::Hermite);
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setResamplerFrequency(44100.0);
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setChannels(2);
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setPrecision(16);
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setFrequency(44100.0);
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setVolume(1.0);
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setBalance(0.0);
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clear();
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}
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DSP::~DSP() {
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if(resampler) delete resampler;
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}
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auto DSP::sample(int channel[]) -> void {
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for(auto c : range(settings.channels)) {
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buffer.write(c) = (double)channel[c] * settings.intensityInverse;
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}
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buffer.wroffset++;
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resampler->sample();
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}
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auto DSP::pending() const -> bool {
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return output.rdoffset != output.wroffset;
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}
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auto DSP::read(int channel[]) -> void {
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adjustVolume();
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adjustBalance();
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for(auto c : range(settings.channels)) {
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channel[c] = clamp(settings.precision, output.read(c) * settings.intensity);
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}
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output.rdoffset++;
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}
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auto DSP::write(double channel[]) -> void {
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for(auto c : range(settings.channels)) {
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output.write(c) = channel[c];
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}
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output.wroffset++;
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}
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auto DSP::adjustVolume() -> void {
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for(auto c : range(settings.channels)) {
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output.read(c) *= settings.volume;
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}
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}
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auto DSP::adjustBalance() -> void {
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if(settings.channels != 2) return; //TODO: support > 2 channels
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if(settings.balance < 0.0) output.read(1) *= 1.0 + settings.balance;
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if(settings.balance > 0.0) output.read(0) *= 1.0 - settings.balance;
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}
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auto DSP::clamp(const uint bits, const int x) -> int {
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const int b = 1U << (bits - 1);
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const int m = (1U << (bits - 1)) - 1;
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return (x > m) ? m : (x < -b) ? -b : x;
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}
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auto DSP::clear() -> void {
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buffer.clear();
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output.clear();
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resampler->clear();
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}
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}
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